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Make: More Electronics
book

Make: More Electronics

by Charles Platt
April 2014
Beginner to intermediate content levelBeginner to intermediate
392 pages
14h 57m
English
Make: Community
Content preview from Make: More Electronics

Chapter 18. Experiment 18: Time to Switch

Figure 18-1 introduces a new concept. It shows how each logic gate can be emulated by a pair of plain, ordinary switches, and each switch can be considered as an input to the gate.

When a switch is pressed, it’s the same as a logic input being high. When it is not pressed, this is the same as a logic input being low. Thus, in the illustration, the top pair of switches gives a high output only if the left switch AND the right switch are both pressed. Just like an AND gate!

Although—not quite. An AND gate output is either high or low. When the switches are open in Figure 18-1, the output is an open circuit. It will be floating, with no defined voltage. We need to add a pulldown resistor to control the state ...

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Publisher Resources

ISBN: 9781449344030Errata PagePurchase book